 Diode from 1972, Finding a replacement |
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| worn |
 Jul 1 2022, 07:32 PM
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#1
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can't remember  Group: Members Posts: 3,162 Joined: 3-June 11 From: Madison, WI Member No.: 13,152 Region Association: Upper MidWest 
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The diode between the alternator bootstrap circuit and the brake warning system has failed in my ‘72. To me, a diode is a tiny glassy thing you solder onto a PCB. I suspect though that an automotive diode might not best be ordered from Mouser. Can someone give me a path to replacement? How many Watts, etc? Thanks.
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| Spoke |
Jul 1 2022, 09:36 PM
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Jerry Group: Members Posts: 6,991 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None
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If I'm reading this correctly, @worn 's '72 has a 911 engine in it. The diode in question is in series with the GEN light. This picture is from the '86 930 schematic showing the diode 911-617-108-00 in series with the GEN light. This diode failed on my 930 and stopped the alternator from starting up. If the diode is shorted or removed, the engine will not shut off since the GEN light powers a couple of critical circuits.
I don't recall which diode I used to replace this but I think any 100V, 5A silicon diode should work. Here's a 100V, 6A silicon diode at Digikey that should work. It will cost you $0.74. Diode Standard 100 V 6A Through Hole P600 Attached image(s) 
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| GregAmy |
Jul 2 2022, 09:15 AM
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Advanced Member Group: Members Posts: 2,311 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States
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QUOTE(Spoke @ Jul 1 2022, 11:36 PM)  The diode in question is in series with the GEN light...This diode failed on my 930 and stopped the alternator from starting up. If the diode is shorted or removed, the engine will not shut off since the GEN light powers a couple of critical circuits... EXACTLY my problem when I Microsquirted my D-Jet 2L. There is no diode on the /4 GEN circuit but the D-Jet system draws enough load that it drops the connection and the car dies; not so with the modern MS system (simply amazing that an entire EFI system can be powered through that small incandescent bulb.) A diode fixed it. A diode is a diode, as long as it can handle the amps in the desired direction. I installed a solar panel PV diode in the GEN circuit and have many left over if you want me to put one in an envelope for you: https://www.amazon.com/gp/product/B01CXOQMJ8 Then again, at $7 shipped for 20 of them, it might just be better to order a pack for yourself and have them arrive tomorrow... |
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Posts in this topic
worn Diode from 1972 Jul 1 2022, 07:32 PM
Spoke I would imagine any simple silicon diode would wor... Jul 1 2022, 07:55 PM davep Do you have a diagram showing the location in the ... Jul 1 2022, 07:58 PM jim_hoyland Could be located behind the gauge cluster ? Jul 1 2022, 08:52 PM 914Sixer You need one of these? Jul 2 2022, 08:49 AM
worn
You need one of these?
Bingo! The is what h... Jul 2 2022, 09:51 AM
worn
You need one p
This is what is inside. I probabl... Jul 4 2022, 12:23 PM 914Sixer Shoot me a PM with your shipping info. Jul 2 2022, 11:17 AM jim_hoyland Did other years use the diode too ?
?? Jul 2 2022, 11:22 AM Chris914n6 It's used as a one-way circuit. My late 90s Ni... Jul 2 2022, 12:19 PM Spoke That diode connection looks aftermarket and not OE... Jul 4 2022, 04:08 PM worn
That diode connection looks aftermarket and not O... Jul 4 2022, 05:10 PM |
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